Ground fault detection device and method
A ground fault and detection device technology, which is applied in the direction of measuring device, measuring electricity, short circuit test, etc., can solve the problems of ground cable insulation aging, inability to effectively detect ground fault, fire, etc., and achieve the effect of avoiding insulation aging
Active Publication Date: 2021-09-24
厦门科华数能科技有限公司
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Problems solved by technology
[0004] The purpose of the present invention is to provide a ground fault detection device, aiming to solve the problem that the existing technology cannot effectively detect the ground fault that occurs on the AC side of the photovoltaic power generation system, resulting in the insulation of the ground cable when a large fault current flows for a long time Aging, and even fire problems
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[0054] It should be noted that, for ease of description, the single-point grounding systems described in the embodiments of the present application all take a photovoltaic power generation system as an example, including a photovoltaic array that converts solar energy into electrical energy and outputs direct current, and an inverter that converts direct current to alternating current The single-point grounding means that there is only a single grounding point in the photovoltaic power generation system (the positive or negative pole set at the output end of the photovoltaic array, that is, the positive pole or negative pole of the DC side). For the convenience of description, this application implements All examples take the negative grounding system as an example.
[0055] like figure 1 As shown, the ground fault detection device provided by the embodiment of the present invention includes: an AC grounding detection module 00 and a controller 30 .
[0056] AC grounding dete...
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The invention relates to the technical field of fault detection, and provides a ground fault detection device and method. The device includes: an AC ground fault detection module and a controller; It is connected to the C-phase power and the ground, and is used to sample the ground voltage of the A-phase power, the B-phase power and the C-phase power respectively, correspondingly obtain the first sampling voltage, the second sampling voltage and the third sampling voltage, and send the To the controller; the controller is used to judge whether there is a ground fault on the AC side before the photovoltaic power generation system is connected to the grid according to the above sampling voltage, and if there is a ground fault, send an alarm signal. The above-mentioned ground fault detection device can realize the detection of the ground fault on the AC side by the photovoltaic power generation system, and prevent the ground cable from being subjected to a large fault current for a long time to cause insulation aging and even fire.
Description
technical field [0001] The invention belongs to the technical field of fault detection, and more particularly, to a ground fault detection device and method. Background technique [0002] In photovoltaic power generation systems, since photovoltaic cells are affected by polarization effect and transparent conductive oxide (TCO) erosion, the impact will directly lead to a significant drop in the power generation efficiency of the panels, and even permanent damage to the panels. Therefore, it is necessary to form a single-point grounding system by grounding the negative electrode (or positive electrode) of the photovoltaic cell array to solve the above problems. [0003] In the traditional technology, fuses are often used to directly ground the negative pole of the single-point grounding system. When a direct grounding fault occurs, the fault current is much larger than the rated current of the fuse, which triggers the fuse to disconnect and achieves the effect of grounding pr...
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IPC IPC(8): G01R31/52
CPCG01R31/50
Inventor 曾春保洪培在魏闻林镇煌陈凯龙
Owner 厦门科华数能科技有限公司